Method and apparatus for cleaning spinning chamber in ringless spinning machine

ABSTRACT

A system for cleaning a spinning chamber of a ringless spinning machine having spinning units each provided with a body, a feed roller, a combing roller and a rotary spinning chamber and adapted to control the feed roller by the actuation of a yarn breakage sensing feeler. The body which holds the spinning chamber of the spinning unit is tilted to stop the rotation of the spinning chamber when a yarn breakage occurs. A suction is first applied to the spinning chamber to discharge the fibers remaining therein. Then compressed air is charged into the spinning chamber to loosen the residual material adhering to the inner wall surface of the spinning chamber, this loosened material being then discharged by the suction.

United States Patent [191 Kihara et al.

METHOD AND APPARATUS FOR CLEANING SPINNING CHAMBER IN RINGLESS SPINNINGMACHINE Inventors: Hidetoshi Kihara; Tohoru Urifu;

Osamu Yuasa; Satoki Ejiri, all of Fukui, Japan Assignees: Daiwa BosekiKabushiki Kaisha,

Higashi-ku, Osaka; Kabushiki Igaisha Toyoda lidoshokki Seisakusho,Kariya, both of J apan Filed: Oct. 5 1971 Appl. No.: 186,728

Foreign Application Priority Data Oct. 8, 1970 Japan 45/88429 Mar. 22,1971 Japan 46/16411 US. Cl 57/56, 57/345, 57/58.89 Int. Cl DOlh 11/00Field of Search.... 57/345, 56, 57,

References Cited UNITED STATESPATENTS 8/1970 Landwchrkamp et al. 57/563,597,911 8/1971 Schiltknecht 57/5889 X FOREIGN PATENTS OR APPLICATIONS1,084,664 9/1967 Great Britain 57/5891 Primary ExaminerJohn PetrakesAssistant Examiner-Charles Gorenstein Att0meyE. F. Wenderoth [5 7]ABSTRACT A system for cleaning a spinning chamber of a ringless spinningmachine having spinning units each provided with a body, a feed roller,a combing roller anda rotary spinning chamber and adapted to control thefeed roller by the actuation of a yarn breakage sensing feeler. The bodywhich holds the spinning chamber of the spinning unit is tilted to stopthe rotation of the spinning chamber when a yarn breakage occurs. Asuction is first applied to the spinning chamber to discharge the fibersremaining therein. Then compressed air is charged into the spinningchamber to loosen the residual material adhering to the inner wallsurface of the spinning chamber, this loosened material being thendischarged by the suction.

2 Claims, 15 Drawing Figures PATENTEU SEP25 I973 SHEET 1 0F 8 HIDETOSHIKIHARA, TOHORU URIFU, Inventor s OSAMU YUASA and SATOKI EJIRI sywwwm,@flk/W Attorne PATENIEU 3.760.577

SHEET 2 0F 8 HIDETOSHI KIHARA, TOHORU URIFU, OSAMU YUASA and SATOKIEJIRI,

Inventqrs M we,

Allorneys PATENTEDSEPZSIBB SHEET 3 BF 8 HIDE'IOSHI KIHARA, TOHORU URIFU,

OSAMU YUASA and SATOKI EJIRI,

Inventor A tlorney 5 PATENTEDSEP25|su SHEET t 0F 8 HIDETOSHI KIHARA,TOHORU URIFU, OSAMU YUASA and SATOKI EJIRI,

Inventor ym, $1M A y PATENTED 3,760,577

SHEET 5 OF 8 38 s 40 Y. I 54 Li i 2 24 is I 44 HIDETOSHI KIHARA, l wTOHORU URIFU 5 OSAMU YUASA, and

SATOKI EJIRI Inventors PATENTEB SEP25 I973 SHEET 6 0F 8 HIDETO'SHIKIHARA,

' TOHORU URIFU,

OSAMU YUASA and SATOKI li-JIRI,

nventor PATENTED 2 5 3,760,577

SHEET 7 [IF 8 HIDETOSH IHARA, TOHORU U u, OSAMU YUASA, and SATOKI EJIRI,

Inventor By whim/W1 (Z41! Attorney 5 PATENTED 3.760.577

SHEET 8 [IF 8 HIDETOSHI KIHARA, TOHORU URIFU OSAMU YUASA and SATOKIEJIRI,

Inventors ydmlmtk, $541+ Attorneys BACKGROUND OF THE INVENTION Thepresent invention relates to a method and apparatus for cleaningspinning chambers whereby, in a ringless spinning machine comprising anumber of spinning units arranged side by side and each provided with arotary spinning chamber, upon yarn breakage occurring in a spinning unitduring spinning, the material such as fibers and impurities remaining inthe spinning chamber can be quickly and reliably removed therefrom.

In this type of known ringless spinning machine, a fibrous material iscombed as it is passed over a feed roller and a combing roller. Thecombed fibers along with air are then conveyed through a feed channelinto a rotary spinning chamber wherein'they are gathered together andthen progressively drawn out to form a spun yarn.

In such ringless spinning machine, with the lapse of the running timeduring spinning operation, short fibers, dust and other impuritiesadhere to and accumulate on a part of the inner wall surface of eachspinning chamber. Such adhered and accumulated impurities deterioratethe function of the spinning chamber and eventually cause a yarnbreakage. Further, when fibers directed toward the spinning chamber aredischarged to the rear surface of a circular plate-like separatorpositioned between the feed channel and the spinning chamber, there is aphenomenon in which some of the fibers stay at a part of the rearsurface of said separator. This phenomenon also is a cause of yarnbreakage. In this type of ringless spinning machine, when a yarn breakoccurs due to such cause, the feed roll is stopped to interrupt thefeeding of the fibrous material, but the fibers that have already beenfed into the spinningchamber remain in the spinning chamber along withthe broken yarn end without being drawn-out therefrom. Therefore, it isindispensably necessary to remove the material remaining in the spinningchamber (i.e., the fibers and the impurities adhering to the inner wall)whenever there is a yarn breakage. In the current practice, thisoperation is carried out by a worker using a hand brush. However, thisremoval operation takes much time and, moreover, it is difficult tocompletely remove the remaining material. As a result, it often occursthat without completely removing the material remaining in the spinningchamber, the yarn break is mended and spinning is re-started.Consequently, there is the drawback of a second yarn break occurringwithin a short period of time or a yarn of inferior quality being spun.

Recently, as a method of cleaning spinning chambers after yarn breakage.there have been attempts to impart a sucking action to the interior ofaspinning chamber to impart both sucking and blowing actions to aspinning chamber at the same time for cleaning. In the former method theremaining fibers can be removed but the impurities adhering to the innerwall surface of the spinning chamber cannot be removed, while in thelatter method a whirling current is created in the spinning chamber andthe force of scattering the impurities developed by compressed air blownoff becomes weak, and there is the phenomenon of the fibers to bedischarged clogging the suction tube under the influence of the whirlingcurrent.

OBJECT AND BRIEF DESCRIPTION OF THE INVENTION An object of the presentinvention is to remove and overcome said drawbacks inherent in the knownringless spinning machine described above and provide a method andapparatus for cleaning spinning chambers whereby when a yarn breakoccurs, the material remaining in the spinning chamber can be reliablyand quickly removed therefrom without requiring any high technique. Thepresent invention, in connection with a ringless spinning machinecomprising spinning units each provided with a feed roller, a combingroller and a rotary spinning chamber and adapted to have the feed rollercontrolled by means of a yarn breakage sensing feeler, is characterizedby tilting a body holding the spinning chamber of a spinning unit tostop the rotation of the spinning chamber upon yarn breakage, initiallyapplying a sucking action to said spinning chamber to dischargethefibers remaining in the spinning chamber, and then blowing compressedair into said spinning chamber to separate the residual materialadhering to theinner wall surface of the spinning chamber whereby saidremaining material are discharged by said sucking action.

The invention will now be described in more detail with reference to thedrawings illustrating embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a perspective view of a spinning unit in spinning operation; 1

FIGS. 2 4 show valve means in spinning operation, wherein FIG. 2 is aplan view, FIG. 3 is a sectional view along the line A A of FIG. 2 andFIG. 4 is a sectional view along the line B B of FIG. 2;

FIG. 5 is-a partial sectional side view of the spinning unit showing theprincipal portion thereof;

FIG. 6 is a sectional view of the valve means in the FIG. 5 state;

FIG. 7 is a side view in partial sectional showing the body of thespinning unit in a tilted state;

FIG. 8 is a sectional view of the valve means in the FIG. 7 state;

FIG. 9 is a side view in partial section showing the body of thespinning unit further tilted from the FIG. 8 state;

FIG. 10 is a sectional view of the valve means in FIG. 9 state;

FIGS. 11 and 12 are side views in section showing a manner in whichvalve means different from the one used the above-mentioned embodimentis used;

FIG. 13 is an enlarged sectional view ofa part of FIG. 11;

FIG. 14 is a plan view along the line A A of FIG. 13; and

FIG. 15 is an enlarged perspective view of a separator.

DETAILED DESCRIPTION OF THE INVENTION To begin with, the embodimentshown in FIGS. 1 10 will be described.

The body 1 of a spinning unit has built therein a feed roller 2, acombing roller 3, a yarn breakage sensing feeler 4, and a solenoidclutch 5 for controlling the feed roller by an actuation of said feeler4, and there is disposed a rotor cap 7 opposed to the opening side of arotary spinning chamber 6. The spinning chamber 6 is held for rotationwithin a casing 8 that is pivotally mounted to the spinning unit body 1by a pin 9 and connected to said body 1 by a hook 10. A sliver S fed tothe spinning unit, as already known, is delivered to the combing roller3 by the rotation of the feed roller 2, combed by the combing roller,separated from the peripheral surface of the combing roller 3 by meansof air currents, conveyed via a feed channel 11 to the rotary spinningchamber 6 where the separated fibers are gathered together and thencontinuously withdrawn through a yarn drawing tube 12 by a pair ofdrawing rollers 13 to form a spun yarn Y. Disposed between the outletfrom the yarn drawing tube 12 and the drawing rollers 13 is the yarnbreakage sensing feeler 4, which, when a yarn break occurs in a spinningchamber 6, actuates a lead switch (not shown) to actuate the solenoidclutch 5 to disengage the clutch portion 5', thereby stopping therotation of the feed roller 2 to interrupt the feeding of the sliver S.

In the present invention, such spinning unit 1 houses a suction tube 15and a blow tube 16, said tubes having one of the respective endsextending through the rotor cap 7 and opening to the spinning chamber 6and the other ends connected to valve means 14, and the spinning unitbody 1 is arranged to be tiltable around the axis of a pivot 17 in thelower region thereof through a predetermined angle of inclination. Thevalve means 14, as shown in FIGS. 2 4, is formed of a box 18 having ahollow cylindrical portion and a cylindrical body 19 located therein,the upper surface of the box 18 being provided with openings 20 and 21for connection to said suction and blow tubes 15 and 16, respectively,and the lower surface of the box being provided with an opening 23 forconnection to a tube 22 connected to a suction source (not shown) and anopening 25 for connection to a tube 24 connected to a compressed airsource (not shown). The cylindrical body 19 is provided with suction andblow passageways 26 and 27 out of phase with each other for establishingcommunication between said openings 20 and 23 and between said openings21 and 25, respectively. Further, said cylindrical body 19 is providedwith a shaft 28 to which an arm 29 having a pin 30 at the front endthereof is secured and said pin 30 is fitted in a slot 32 in astationary guide plate 31 so that when the spinning unit body 1 istilted along with the valve means 14, the pin 30 of said arm 29 iscontrolled by the guide plate 31, whereby the cylindrical body 19 isrotated within the box 18 to displace the passageways 26 and 27.Disposed above the rotor casing 8 is a resilient brake 34 secured to theframe 33 of the spinning machine. Said brake 34 is rotatable around theaxis of a pivot 35 and resiliently loaded by a coiled spring 36 whichgives a reaction substantially balancing with a moment resulting fromthe weight of the spinning unit body 1 upon tilting thereof. Thus, whenthe spinning unit body 1 is tilted, the pulley 37 of the rotary spinningchamber 6 is moved out of contact with a driving belt 38 into abutmentagainst the shoe 34 of said brake 34 so that the rotation of thespinning chamber 6 and the tilting of the spinning unit body 1 arestopped. In this state, however, since reaction of the coiled spring 36balances with or overcomes the rotational moment resulting from theweight of the spinning unit body 1, the spinning unit body 1 ismaintained in a supported state by the reaction of said spring 36. Thismeans that the spinning unit body 1 is ready for being further tiltedthrough a predetermined angle of inclination if it is manually urgedagainst the action of the spring 36.

While the spinning unit 1 is tilted due to its own weight as describedabove, the arm 29 is actuated to rotate the cylindrical body 19 so that,as shown in FIG. 8, the upper and lower openings 20 and 23 are caused tocommunicate with each other through the suction passageway 26. As aresult, a sucking action developed by the tube 22 connected to thesuction source acts on the suction tube 15 opening to the rotor cap 7.In this state, the blow passageway 27 has not yet reached thecorresponding openings 21 and 25 and remains closed. However, in amaximum inclined position of the spinning unit body 1 (FIG. 9) assumedas the latter is further tilted against the action of the spring 36 ofthe brake 34, the valve means 14 has been displaced as a result of saidtilting movement into a position where the blow passageway 27establishes communication between the openings 21 and 25, as shown inFIG. 10, whereby compressed air from the tube 24 connected to thecompressed air source is fed to the blow tube 16. Simultaneouslytherewith, the suction passageway 26 also is displaced, but it is soarranged that it continues to maintain communication between theopenings 20 and 23 (see FIG. 3). That is, the relative position of thetwo passageways 26 and 27 or their diameters are designed with dueconsidration given to the range of rotation of the cylindrical body 19attendant on the tilting of the spinning unit body 1.

The function of the embodiment of the invention described so far willnow be described.

When a yarn breakage occurs in the spinning state shown in FIGS. 1 and2, the yarn breakage sensing feeler 4 is first tilted whereby a leadswitch (not shown) is closed to energize the electric circuit to actuatethe solenoid clutch 5 of the feed roller 2 through a relay for stoppingthe feed roller 2 and to energize a yarn breakage indicating lamp 39. Atthe lighting on the indicator lamp 39, the worker walks to the front ofthe spinning unit in question where the yarn break has occurred, and hecarries out the mending of the broken yarn. Prior to effecting themending of the broken yarn, he pushes a push-button for disengaging alocking member (not shown) which locks the spinning unit body 1 in itsspinning position. As a result, the engagement between the spinning unitbody 1 and the machine frame 33 is released so that said body 1 istilted under its own weight around the axis of the pivot 17 until thepulley 37 of the spinning chamber 6 abuts against the brake 34 to assumethe FIG. 7 state where the spinning unit body 1 is stopped. It is to benoted that said tilting is attended with the pulley 37 of the spinningchamber 6 moving out of contact with the driving belt 38 into pressurecontact with the brake shoe 34' whereby the rotation of the spinningchamber 6 is stopped. Further, said tilting of the spinning unit body 1actuates the arm 29 to rotate and displace the cylindrical body 19 ofthe valve means 14 so as to align the suction passageway 26 with theupper and lower openings 20 and 23 in the box 18 to establishcommunication between the two openings 20 and 23, as shown in FIG. 8, sothat the suction force from the suction source (not shown) is admittedinto the suction tube 15 to apply suction to the spinning chamber 6through the open end of said suction tube 15. By the sucking action ofthe suction tube 15, the residual 'fibers released from centrifugalforce by the stoppage of the spinning chamber 6' and also the fibersadhering to the rear surface of the separator are first sucked anddischarged toward the suction source.

Subsequently, as the worker further tilts the spinning unit body Imanually against the rotation of the spring 36 until it assumes thestate shown in FIG. 9, the blow passageway 27 becomes aligned with theupper and lower openings 21 and 25 to establish communicationtherebetw'e'en, as shown in FIG. 10, so that the compressed air from thecompressed air source is fed into the blow tube 16, through whichcompressed air is blown against the inner wall surface of the spinningchamber 6. As is apparent from FIG. 10, the suctionpassageway 26 towhich suction was previously applied still maintains communicationbetween the two openings and 23 even during said feeding of compressedair. Therefore, when the compressed air is blown into the spinningchamber 6, the residual material on the inner wall surface of thespinning chamber which the previous sucking action failed to remove isremoved by the blowingof the compressed air and sucked bythe suckingforce of the suction tube 15 and discharged toward the suction source.Thereafter, the spinning unit body 1 is returned to its originalposition and locked to the frame 33. Thus the cleaning of the spinningchamber 6 is completed. Further, if necessary, in order that inspectionof the interior of the spinning chamber 6 and removal of a separator 40may be easilycarried out, due consideration is given so as to make itpossible to open the spinning chamber simply by releasing the hook 10.This results in the clockwise rotation of the rotor casing 8 under itsown weight around the axis of the pin 9 through a predetermined angle ofinclination.

In the embodiment described so far, a manner has been shown in which thetwo-step tilting of the spinning unit body 1 applies first a suckingaction and then a blowing action to the spinning chamber 6, but thepresent invention is not limited thereto, it being only necessary forthe invention to have a construction such that after the tilting of thespinning unit body 1 to stop the rotation of the'spinning'chamber 6subsequent to yarn breakage, it is possible to impart first suckingaction to the spinning chamber 6 and then a blowing action theretoduring continuation of said sucking action. For example, the valve means14 may be divided into two parts, a suction valve and blow valve, sothat the suction valve is first opened automatically in connection withthe first stage tilting of the spinning unit body under its own weight,as described above, to impart a sucking action to the spinning chamber 6and the blow valve is then manually opened to blow compressed air intothe spinning chamber 6 without imparting a second stage tilting movementto the spinning unit body 1. In this case, the brake may be of the fixedtype and it is not necessary to support it by the spring 36 to make itmovable.

From the foregoing description, it will be seen that in a ringlessspinning machine comprising spinning units each having a feed roller 2,a combing roller 3 and a spinning chamber 6 and adapted to control thefeed roller 2 by the actuation of a yarn breakage sensing feeler 4, thepresent invention provides a method of cleaning the spinning chamberscomprising, upon yarn breakage, tilting a spinning unit body 1, whichsupports its associated spinning chamber 6, to stop the rotation of thelatter, applying first a sucking action to the interior of the spinningchamber 6 to discharge the residual fibers and then blowing compressedair into said spinning chamber 6 to remove the residual materialadhering to the inner wall surface of the spinning chamber 6. As aresult of this arrangement, the material remaining in the spinningchamber upon yarn breakage can be reliably and quickly removed.

It will also be seen that the present invention provides an apparatusfor carrying out said method, comprising means for tilting a spinningunit body 1 supporting its associated spinning chamber 6, a brake 34disposed above a spinning machine frame 33 and resiliently supported bya spring 36, said spinning unit body 1 housing a suction tube 15 and ablow tube 16, one of the respective ends of said tubes opening to thespinning chamber 6, and valve means at the other ends of said tubeswhereby when the spinning unit body 1 is tilted to bring the pulley 37of the spinning chamber 6 into abutment against said brake 34,communication is established between a suction source and said suctiontube 15 and when the spinning unit body 1 is further tilted against theaction of said spring 36 of the brake 34, communication is establishedbetween a blow source and a blow tube 16. Thus, in the case where a yarnbreakage occurs and is to be mended, releasing of engagement between themachine frame 33 and the spinning unit body 1 results in the tilting ofthe spinning unit body I under its own weight, which, in turn, resultsin bringing the pulley 37 of the spinning chamber 6 into abutmentagainst the brake 34 whereby the rotation of the spinning chamber 6 isstopped, and at the same time the tilting of the spinning unit body 1under its own weight is controlled by said brake, said tilting causingthe valve means 14 to apply a sucking action to the interior of thespinning chamber. When the spinning unit body 1 is further tiltedagainst the action of the spring 36, compressed air is blown from theblow tube 16 into the spinning chamber wherein the residual material inthe spinning chamber 6 which the previous suction force failed to removeis scattered and then discharged through the suction tube 15 which isstill in operation. It should be understood that such cleaning of thespinning chamber 6 is accomplished by the operation of the spinning unitbody 1. Thus anyone can easily carry out the cleaning of the spinningchamber 6 without requiring skill.

Next, another embodiment shown in FIGS. 11 15 will now be described.

In the embodiment shown in FIGS. 11 15, the blow groove 41 of the blowtube 16in the preceding embodiment is arranged substantially in thedirection of and along with the feed channel 11 and a small amount ofair is constantly blown from said blow groove 41 during the spinningoperation to control the direction of flow of fibers fed in from thefeed channel 11. When a yarn breakage occurs and the spinning unit body1 is tilted, a sucking action is first applied to a suction tube 15 andthen the amount of air fed by the blow tube 16 is increased to carry outthevcleaning of the spinning chamber 6 in the manner described inconnection withthe preceding embodiment.

More particularly, there "is provided a suction tube 15 in the spinningunit body 1, the front end of which opens to the spinning chamber andthe terminal end of which communicates with a suction source 44 througha switching valve 43, and there is also provided a blow tube 16 in thespinning unit body 1 having an outlet end groove 41 arrangedsubstantially in the direction of and along with the feed channel 1 land opening to the rear of the outlet from the feed channel and an inletend which communicates with a compressed air source 46 through atwo-stage flow control changeover valve 45. The reference numeral 47designates a brake member associated with the pulley 37 of the spinningchamber 6, the arrangement being such that when the spinning unit body 1is tilted, the pulley 37 of the spinning chamber 6 which is displacedtherewith abuts against said brake member 47 to stop the rotation of thespinning chamber 6. The numeral 48 designates a locking member forlocking the spinning unit body 1 and the frame 33 together. Said lockingmember has a hook portion 49 urged toward the frame 33 by a spring 50,and a stem 48 opposed to an electromagnet 52 adapted to be energized byan actuation of a yarn breakage sensing feeler 4. The numeral 53designates a solenoid for restoring the tilted spinning unit body 1 toits normal position, said solenoid being adapted to be energized by anaction of a timer (not shown) only at the time of returning of said body1 upon lapse of a predetermined period of time after said body 1 istilted.

if a yarn breakge occurs in the spinning chamber 6 of a spinning unit,the yarn breakage sensing feeler 4 first senses it whereby a lead switch(not shown) is closed to energize an electrical control circuit (notshown) to actuate the solenoid clutch 5 through a relay to stop the feedroller 2. At the same time, the electromagnet 52 is energized to attractthe stem 51 of the locking member 48 against the action of the spring50, thereby releasing the hook 49. Thereby, the spinning unit body 1 isoutwardly tilted under its own weight around the axis of a pivot 17through predetermined angle of inclination until it is stopped by theaction of a latch 54. This tilting displaces the spinning chamber 6 sothat the pulley 37 of said spinning chamber 6 is moved out of contactwith a driving belt 38 into abutment against the brake member 47 wherebyit is stopped. Thereafter, in accordance with a signal from theelectrical control circuit (not shown) the switching valve 43 is openedto impart a sucking action to the suction tube to suck and remove thefibers remaining in the spinning chamber 6 through the front end opening42. Subsequently, the flow control changeover valve 45 is changed overto an intense flow so that a larger amount of compressed air is blowninto the spinning chamber 6 to scatter the remaining material adheringto the inner wall surface of the spinning chamber 6, said material beingthen removed through the suction tube 15.

Therefore, in this embodiment, the switching valve 43 for the suctiontube 15 remains closed during the spinning operation shown in FIG. 11.And a small amount of compressed air is blown from behind the outlet 11'from the feed channel 11 in the direction of feed of the fibers (seeFIG. 13). This flow of air is effective to quickly move all of thefibers, delivered from the outlet 1 1 of the feed channel, toward thewall surface of the spinning chamber 6, and to make up for a decrease inthe rate of flow of fibers in a space behind the separator 40 and thusprevent the stagnation phenomenon of fibers, thereby ensuring favorableconditions for spinning.

When a yarn breakage occurs, as described above and shown in FIG. 12,the tilting of the spinning unit body 1 causes the switching valve 43 toopen to pass a sucking action to the spinning chamber 6 at rest toremove the fibers remaining therein. Subsequently, the flow controlchangeover valve 45 is changed over from weak to intense flow so thatthe amount of air being fed from the compressed air source is increasedto pass an intense flow of compressed air to the spinning chamber 6 toscatter the impurities adhered to the inner wall surface of the spinningchamber, which are then discharged through the suction tube 15.Thereafter, in accordance with a signal from the electrical controlcircuit, the solenoid 53 is actuated to' bring the spinning unit body 1back to the original position and at the same time the electromagnet 52is deenergized to permit the hook 49 to lock said body 1 to the frame 33and the switching valve 43 is closed while the changeover valve 45 isturned to weak flow. In this way the cleaning of the spinning chamber 6is automatically completed.

As has been described so far, according to the present invention, when ayarn break occurs in a spinning unit, the body 1 is tilted to stop thespinning chamber, whereupon sucking action is first applied to thespinning chamber at rest to remove the residual fibers and thencompressed air is blown thereinto to scatter the impurities adhering tothe inner wall surface of the spinning chamber 6, which are then suckedand discharged. As a result of this arrangement, the cleaning efiect ishigh as compared with the case of cleaning solely by a sucking action orby applying a sucking and a blowing action at the same time.

We claim:

1. An apparatus for cleaning a rotary spinning chamber ofa spinning unitof a ringless spinning machine, said spinning unit comprising a body, afeed roller and a combing roller operatively arranged in said body, arotary spinning chamber, and a pulley operatively connected to saidrotary spinning chamber for rotatively driving the same, said apparatuscomprising:

a casing mounted on said body and rotatably supporting said spinningchamber therein; a stationary frame;

a spring-biased brake member mounted on said stationary machine framefor selective engagement with said driving pulley to brake said spinningchamber, said body being pivotably connected to said stationary machineframe at the bottom portion of said body, so that said body is tiltablebetween a first non-tilted position wherein the yarn is spun, a secondtilted position wherein said driving pulley is brought into abutmentwith said brake member, and a third tilted position wherein said bodyhas been further tilted from said second tilted position;

a locking member for normally locking said body in said first position;

a suction tube extending through said body and having one end thereofopening into the interior of said spinning chamber for sucking airtherefrom, the opposite end of said suction tube extending outside saidbody;

a blow tube extending through said body and having one end thereofopening into the interior of said spinning chamber for blowing airthereinto, the opposite end of said blow tube extending outside said y;

a suction source connected to said opposite end of said suction tube;

a pressure source connected to said opposite end of said blow tube;

and valve means arranged in said suction tube and said blow tube forestablishing communication between said suction source and the interiorof said spinning chamber through said suction tube responsive to thetilting movement of said body from said first position into said secondposition, and for establishing communication between said pressuresource and the interior of said spinning chamber through said blow tuberesponsive to the tilting movement of said body from said secondposition into said third position.

2. An apparatus for cleaning a rotary spinning chamber of a spinningunit of a ringless spinning machine, said spinning unit comprising abody, a feed roller and a combing roller operatively arranged in saidbody, a rotary spinning chamber, and a pulley operatively connected tosaid rotary spinning chamber for rotatively driving the same, saidapparatus comprising:

a casing mounted on said body and rotatably supporting said spinningchamber therein; a stationary frame;

a brake member mounted on said stationary machine frame for selectiveengagement with said driving pulley to brake said spinning chamber, saidbody being pivotably connected to said stationary machine frame at thebottom portion of said body, so that said body is tiltable between afirst non-tilted position wherein the yarn is spun, and a second tiltedposition wherein said driving pulley is brought into engagement withsaid brake member;

a locking member for normally locking said body in said first position;

a suction tube extending through said body and having one end thereofopening into the interior of said spinning chamber for sucking airtherefrom, the opposite end of said suction tube extending outside saidbody;

a blow tube extending through said body and having one end thereofopening into the interior of said spinning chamber for blowing airthereinto, the opposite end of said suction tube extending outside saidbody;

a suction source connected to said opposite end of said suction tube;

a pressure source connected to said opposite end of said blow tube;

a switching valve means arranged in said suction tube for selectivelyestablishing communication between said suction source and said interiorof said spinning chamber through said suction tube responsive to thetilting movement of said body from said first position into said secondposition;

and a two-stage flow control changeover valve means arranged in saidblow tube for permitting a relatively small amount of air from saidpressure source into the interior of said spinning chamber through saidblow tube when said body is in said first position and for permitting arelatively large amount of air from said pressure source into theinterior of said spinning chamber through said blow tube responsive tothe tilting movement of said body from said first position into saidsecond position.

1. An apparatus for cleaning a rotary spinning chamber of a spinningunit of a ringless spinning machine, said spinning unit comprising abody, a feed roller and a combing roller operatively arranged in saidbody, a rotary spinning chamber, and a pulley operatively connected tosaid rotary spinning chamber for rotatively driving the same, saidapparatus comprising: a casing mounted on said body and rotatablysupporting said spinning chamber therein; a stationary frame; aspring-biased brake member mounted on said stationary machine frame forselective engagement with said driving pulley to brake said spinningchamber, said body being pivotably connected to said stationary machineframe at the bottom portion of said body, so that said body is tiltablebetween a first non-tilted position wherein the yarn is spun, a secondtilted position wherein said driving pulley is brought into abutmentwith said brake member, and a third tilted positiOn wherein said bodyhas been further tilted from said second tilted position; a lockingmember for normally locking said body in said first position; a suctiontube extending through said body and having one end thereof opening intothe interior of said spinning chamber for sucking air therefrom, theopposite end of said suction tube extending outside said body; a blowtube extending through said body and having one end thereof opening intothe interior of said spinning chamber for blowing air thereinto, theopposite end of said blow tube extending outside said body; a suctionsource connected to said opposite end of said suction tube; a pressuresource connected to said opposite end of said blow tube; and valve meansarranged in said suction tube and said blow tube for establishingcommunication between said suction source and the interior of saidspinning chamber through said suction tube responsive to the tiltingmovement of said body from said first position into said secondposition, and for establishing communication between said pressuresource and the interior of said spinning chamber through said blow tuberesponsive to the tilting movement of said body from said secondposition into said third position.
 2. An apparatus for cleaning a rotaryspinning chamber of a spinning unit of a ringless spinning machine, saidspinning unit comprising a body, a feed roller and a combing rolleroperatively arranged in said body, a rotary spinning chamber, and apulley operatively connected to said rotary spinning chamber forrotatively driving the same, said apparatus comprising: a casing mountedon said body and rotatably supporting said spinning chamber therein; astationary frame; a brake member mounted on said stationary machineframe for selective engagement with said driving pulley to brake saidspinning chamber, said body being pivotably connected to said stationarymachine frame at the bottom portion of said body, so that said body istiltable between a first non-tilted position wherein the yarn is spun,and a second tilted position wherein said driving pulley is brought intoengagement with said brake member; a locking member for normally lockingsaid body in said first position; a suction tube extending through saidbody and having one end thereof opening into the interior of saidspinning chamber for sucking air therefrom, the opposite end of saidsuction tube extending outside said body; a blow tube extending throughsaid body and having one end thereof opening into the interior of saidspinning chamber for blowing air thereinto, the opposite end of saidsuction tube extending outside said body; a suction source connected tosaid opposite end of said suction tube; a pressure source connected tosaid opposite end of said blow tube; a switching valve means arranged insaid suction tube for selectively establishing communication betweensaid suction source and said interior of said spinning chamber throughsaid suction tube responsive to the tilting movement of said body fromsaid first position into said second position; and a two-stage flowcontrol changeover valve means arranged in said blow tube for permittinga relatively small amount of air from said pressure source into theinterior of said spinning chamber through said blow tube when said bodyis in said first position and for permitting a relatively large amountof air from said pressure source into the interior of said spinningchamber through said blow tube responsive to the tilting movement ofsaid body from said first position into said second position.